JPH07210441A - Communication system and communication method - Google Patents

Abstract

(57) [Abstract] [Purpose] In a communication system having a first computer that manages a master file and a second computer that has a copy of the master file, receiving master file change information from the first computer When the master file is restored on the second computer, it is possible to confirm the match of the master file. [Structure] The first computer 1 creates check data 43 and sends the check data 43 to the second computer 2 together with the change instruction data 41. The second computer 2 creates the check data 53 based on the change instruction data and collates the check data 53 with the check data 43. Also, the check data 53 is transmitted from the second computer 2 to the first computer 1 as a master file change result response,
The computer 1 collates the check data 43 with the received check data 53 to grasp the restoration status of the master file of the second computer 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer that uses a master file for changing master files, in which a computer that creates, changes, and manages a master file and a computer that uses the master file are connected via a communication network. The present invention relates to a communication system for notification, and in particular, relates to grasping the processing status of a computer that uses a master file by a computer that manages the master file.

[0002]

2. Description of the Related Art In a communication system in which a plurality of computers are connected by a communication network, a computer that creates, changes, and manages a master file (hereinafter referred to as a master file management computer) and a computer that uses the master file (Hereinafter, referred to as a master file use computer) is connected via a communication network, and when the master file management computer changes the master file, the master file management computer issues a change instruction regarding the change of the master file to the master file use computer, for example. , Which is issued by the function code communication, and the master file use computer changes the master file according to the above instruction. In this autonomous distributed system, since the master file management computer and the master file usage computer both have the same master file, even if the master file management computer goes down, the master file usage computer can continue processing. The operation of the object controlled by the computer is not stopped. Note that function code communication means that a number determined by the content of the data to be sent is added to the beginning of the data to be sent, and the receiving side
It is judged from the number whether or not it should be received, and when it is received, the data following the number is received and recorded in the recording device. An example of an autonomous distributed system is a system that manages train operation. This is to determine the railroad track (railroad track) on which the train runs and to control the connection of the railroad tracks in accordance with the determination. In this system, the train company headquarters computer has a train schedule master file, and some stations have slave computers. The slave computer has a master file that has the same contents as the master file of the train schedule of the computer at the head office. I do. In the case of this system, when sending data from the computer at the head office, data to be sent to all computers (for example, changing the timetable), data to be sent to a computer at a specific station, or to a local station The above number is determined depending on whether or not the data should be sent only to a certain computer, and the function code communication is performed.
As described above, in a communication system in which a plurality of computers are connected by a communication network, conventionally, when a master file management computer receives a master file change instruction from a user and changes the master file, the master file management instruction is issued. Only or only the changes themselves were sent to the master file usage computer.

[0003]

In the above prior art, the master file management computer only returns a response from the master file utilization computer that the instruction regarding the modification of the master file or the modification content itself has been received. Therefore, the master file management computer could not know whether the master file management computer received the data correctly without any error on the communication line, or whether the master file management computer generated the master file correctly. . Therefore, there is a problem in that even if the contents of the master file on the computer using the master file are different, it cannot be understood. For example, in the case of the system that manages train operation described above,
When an instruction to change the timetable is given, the instruction to change the timetable is transmitted to the slave computer. At that time, it is checked whether the slave computer has received it, but it is not checked whether the file contents of the slave computer have been changed correctly. Therefore, a situation may occur in which another train is already on the track where the train is instructed to enter. An object of the present invention is to confirm, when a master file is changed, that the information processing device that manages the master file matches the contents of the master file of the information processing device that uses the master file with the contents of its own master file. It is to provide a communication system capable of performing.

[0004]

According to the present invention, there is provided a first information processing apparatus for creating a master file, and at least one first information processing apparatus having a file having the same content as the master file for utilizing information of the master file. And a second information processing device, wherein the first information processing device and the second information processing device are interconnected via a communication network. When receiving the change instruction information for instructing the change of the file and transmitting the change instruction information for instructing the change of the file of the second information processing apparatus, the first determining means for determining the change content of the master file Firstly, the second information processing apparatus checks whether there is an error in the changed content of the file obtained based on the received change instruction information.
First to generate check data for the check data based on the changes
And a first transmitting means for transmitting the change instruction information and the first check data to the second information processing apparatus via the communication network. Is a receiving unit that receives the change instruction information and the first check data, a second determining unit that determines the change content of the file based on the received change instruction information, and the change content has an error. At least a second generation means for generating second check data for checking whether or not the second check data is based on the change content, and a collation means for collating the first check data with the second check data. If there is no match as a result of the above, the second transmission means for transmitting the information capable of confirming the collation result to the first information processing apparatus via the communication network is provided.

[0005]

[Operation] The first generated by each of the first and second generating means
The first information processing apparatus uses the information capable of confirming the collation result between the check data and the second check data,
In the second information processing apparatus, it is possible to know whether the changed content of the master file has been correctly determined. The information that can be used to confirm the collation result may be, for example, the second check data itself. In this case, in the first information processing apparatus, the first check data possessed by itself and the second check data received from the second information processing apparatus are collated, and the coincidence / disagreement is found. Further, the information which can confirm the collation result may be match / mismatch information which is the result of the second information processing apparatus collating the first check data and the second check data. In this case, the first information processing apparatus receives this match / mismatch information from the second information processing apparatus, so that the match / mismatch can be directly recognized. Then, the first information processing apparatus can retransmit the master file change instruction information when it is determined to be abnormal. In the second information processing device,
By comparing the second check data generated by itself with the first check data received from the first information processing apparatus, it is possible to know whether the match / mismatch occurs. As a result, it is possible to confirm the validity of the content of the change of the master file made based on the instruction of the first information processing apparatus, and when it is determined that there is an abnormality, the master file can not be updated.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall block diagram of this embodiment. The first computer 1 has a file change data generation mechanism 22, a file edit mechanism 23, and a rationality check mechanism that generate change data according to an instruction from the input / output terminal 3. 24, first computer 1
And communication control mechanism 2 for exchanging information with the second computer 2
5, the change instruction file 41 created by the file change data generation mechanism 22, the second as the processing result of the first computer 1.
File 4 that stores information used by the computer 2
2. A check data file 43 for storing check data for determining whether data can be transmitted, a work memory 8 used in each mechanism, a control mechanism 21, and a first computer 1 for data input / output. Input / output terminal 3
Composed of. The file editing mechanism 23 creates, updates, and manages the master file, and creates check data for determining whether data transmission is possible. The rationality check mechanism 24 judges the response of the second computer 2 regarding the changed part of the file editing result. The control mechanism 21 controls the file change data generation mechanism 22, the file editing mechanism 23, the rationality check mechanism 24, the communication control mechanism 25, the change instruction file 41, the master file 42, the check data 43, and the work memory. An autonomous distributed network 10 is connected to the first computer 1, and a plurality of second distributed networks are connected to the autonomous distributed network 10.
Computer 2 is connected. The second computer 2 exchanges information with the first computer 1 by the following function code communication. When transmitting to the second computer 2, the first computer 1 also transmits a function code (identification information) corresponding to the type of information to be transmitted, and does not specify the recipient of this information. Output to the autonomous distributed network 10 and the second
The computer 2 determines whether to receive the information output to the autonomous distributed network 10 based on the function code. The second computer 2 includes a communication control mechanism 34 for exchanging information with the first computer 1, a file editing / restoring mechanism 32 for restoring a master file based on file change information from the first computer 1, and a master file for the master file. A response data creation mechanism 33 that creates response data for the first computer 1 by restoration, a plant control mechanism 35 that controls the plant control device 6 connected to the second computer, and a master file of the first computer 1 A master file 52 that is a duplicate,
A check data file 53 created at the time of restoring the master file, a file editing / restoring mechanism 32, a response data creating mechanism 33, a master file 52, and check data 5
It is composed of a control mechanism 21 for controlling 3. The plant control device 6 is used to control the manufacturing plant. FIG. 2 shows the work memory allocation of the computer. In the work memory 8 of the first computer 1, the change instruction data work 8
2, record work 83, change instruction transmission edit work 8
4, check data 1 work 43-5, check data 2 work 53-3, and response data reception work 93-1 are allocated, and the work memory 9 of the second computer 2 has change instruction data reception work 84-1, The change instruction data work 41-3, the record work 92, and the response transmission data editing work 93 are assigned. FIG. 3 shows the control mechanism 21 of the first computer 1 and the second computer 2. This analyzes interrupt factors such as external interrupts of the communication devices and I / O devices to the computers 1 and 2 and software interrupts generated in the internal processing of the computer, and manages external input / output, timers, and memory. An interrupt control mechanism 61 for controlling management / task management operates by an interrupt from external input / output, and performs data input from the external input / output device 3 or displays on the external input / output device 3 in response to a display request from a task. External input / output management unit 62, timer management unit 63 that performs time-division processing / computer time update by interruption for a fixed time, memory management unit 64 that manages data in main memory and auxiliary memory, task management unit that manages each business processing task It is a so-called OS composed of 65. FIG. 4 shows the file change data generation mechanism 2 of the first computer 1.
2 shows a processing flow of No. 2. In step 101, data for changing a file (in the case of a train operation management system, data relating to change of train number and time or track number) is taken out from the terminal. Step 102, Step 10
The rationality check of the file change data extracted in 1 is performed. For example, in the case of a train operation management system, it is checked whether there is any inconsistency in the data regarding the change of time or track. If the input data is abnormal in step 102, an alarm message is output to the input / output terminal 3 in step 103. If the input data is normal in step 102, the change instruction file 41 is created in step 104. In step 105, the file editing mechanism 23 is activated. FIG. 5 shows a processing flow of the file editing mechanism 23 of the first computer 1. The operation is started by the activation of step 105. In step 201, the step 104
The change instruction file 41 created in step 1 is taken out to the update instruction data work 82. In step 202, the record of the master file 42 indicated by the change instruction data, which is the content of the change instruction data work 82, is taken out to the record work 83. In step 203, the corresponding data in the record work 83 is updated with the change data in the change instruction file 41. In step 204, the record work 83 updated in step 203 is stored in the record of the master file 42. In step 205, the check data (C0) of the updated record work 83 is created and stored in the check data file 43. There are various methods of creating check data, but for example, there is a method of summing the bits in one byte for each byte. In step 206, the change instruction data work 82 fetched in step 201, the check data (C0) created in step 205 and a predetermined header are edited in the change instruction transmission edit work 84. In step 207, the master file is transmitted to the plurality of second computers 2 having a copy.
FIG. 6 shows a processing flow of the file edit / restoration mechanism 32 of the second computer 2. In step 401, the first computer 1
In the change instruction data reception work 84-1, the change instruction reception data received by the communication control mechanism 34 of the second computer 2 by transmitting the master file change instruction 41 created in
Take it out. In step 402, the change instruction data in the change instruction data receiving work 84-1 is extracted to the change instruction data work 41-3. In step 403, the record indicated by the change information of the change instruction data work 41-3 fetched in step 402 is fetched from the master file 52 stored in the second computer 2 to the record work 92. In step 404, the record work 92 is updated by the change instruction of the change instruction data work 41-3 fetched in step 402. In step 405, the check data (C1) of the updated record work 92 is created and stored in the check data file 53. Next, at step 406, the change instruction data receiving work 84-
Check data created on the first computer 1 in 1
Take out (C0). In step 407, in step 4
Check data (C1) created in 05 and step 4 above
The check data (C0) extracted in 06 is collated.
If they match, in step 408, in step 404 described above.
The record work 92 updated in step 1 is stored in the master file 52. If they do not match, a master file restoration abnormality warning is displayed in step 409. In step 410,
The response data creation process 33 is activated to transmit the response data to the first computer 1. FIG. 7 shows the second computer 2
The processing flow of the response data creation processing mechanism 33 of FIG. In step 501, the check data (C0) created when the first computer 1 changes the master file is extracted from the change instruction reception data 84-1. In step 502, the check data (C1) 53 stored in step 406 is taken out. In step 503, the two check data extracted in step 501 and step 502 are edited in the response transmission data work 93 as the response transmission data to the first computer 1. In step 504, the first computer 1
Send to. FIG. 8 shows a processing flow of the rationality check mechanism 24 of the first computer 1. Step 301, second
The response data received by the communication control mechanism 25 of the first computer 1 is transmitted to the response data receiving work 93-1 by transmitting the response transmission data 93 created by the computer 2.
In step 302, the response data receiving work 93-1
The check data (C1) of the file update result in the second computer 2 is extracted to the check data 2 work 53-3. In step 303, the check data from the check data file 43 created in the file editing process 23 is checked.
(C0) is taken out to the check data 1 work 43-5.
Next, in step 304, the check data created by updating the master files of the first computer 1 and the second computer 2 imported in step 302 and step 303 are collated. If they match, the check is normal,
If they do not match, the second computer 2 is judged to be abnormal, and step 3
10 retransmission processing is performed. FIG. 9 shows a processing flow of the step 310. In step 311, the retransmission counter for the corresponding second computer 2 that has received the response is updated. In step 312, the retransmission counter updated in step 311 is compared with the retransmission counter specified value. If it is equal to or larger than the specified value, it is determined in step 314 that the relevant second computer 2 is abnormal, and an alarm is displayed. If it is less than the specified value, in step 313, a request for resending the file change instruction data 41 and the check data 43 to the relevant second computer 2 is made. It will be described below how the communication according to the present invention is performed using such a device. In FIG.
The first computer 1 that creates, changes, and manages master files
The change instruction file 41 created by the file change data creating mechanism 22 is extracted by the file change mechanism 23 into the change instruction data work 82 by the process of step 201 of FIG. In step 202, the record 81 of the master file 42 indicated by the change instruction data of the change instruction data work 82 is taken out to the record work 83. Next step 2
In steps 03 and 204, the hatched portion 83-1 of the contents of the record work 83 is updated and stored in the master file 42 using the change instruction data 41. In step 205, the check data (C0) of the record work 83 is created in response to the processing result of step 203 and stored in the check data file 43. Next, in step 206, the change instruction data work 82 and the check data (C0)
And a predetermined header are edited in the change instruction transmission editing work 84. In step 207, it is transmitted as the master file change instruction information to the plurality of second computers 2. Next, FIG.
The second computer 2 receives the master file change instruction information from the first computer 1, and the second computer 2
Change instruction information in the change instruction data reception work 84-1
Created in. In the file editing / restoring mechanism 32, the change instruction information 84 received by the processing of step 402 of FIG.
The change instruction data 41-2 of -1 is extracted to the change instruction data work 41-3. In step 403, the record 91 indicated by the change instruction data of the change instruction data work 41-3 is taken out to the record work 92. Next step 4
In step 04, the hatched portion 92 of the record work 92 is converted by the change instruction data of the change instruction data work 41-3.
Update -1. In step 405, in step 40
Check data of the record work 92 (C
1) is created and stored in the check data file 53.
In step 406, the change instruction data receiving work 84
The check data (C0) 43-2 of -1 is taken out. The check data (C1) created in step 405 is collated. When they match, it can be determined that the change of the record 91 by the change instruction data 41-2 has been normally performed, and step 4
At 08, the record work 92 is stored in the master file 52. If there is a mismatch in the collation in step 406, the updated record work 92 is judged to be a restoration error and is not stored in the master file 52. next,
In order to notify the first computer 1 of the master file change result, the response data creation mechanism 33 performs the following. In step 501 of FIG. 7, the change instruction data reception work 84
The check data (C0) 43-2 in -1 is taken out. In step 502, the check data (C1) 53 created in step 405 of the file editing / restoring mechanism 32 is taken out. In step 503, the steps 501 and 502 are performed.
The check data and the predetermined header taken out in step 1 are edited in the response transmission data editing work 93 as response data to the first computer 1. In step 504, the data is transmitted to the first computer 1 that is the master file change request source. Next, moving to FIG. 10, in the first computer 1, the communication control mechanism 25 receives the transmission from the second computer 2. The rationality check mechanism 24 fetches the received response data in the response data receiving work 93-1 in step 301 of FIG. In step 302, the response data receiving work 93
The check data (C1) 53-2 created by updating the master file in the second computer 2 within -1 is extracted to the check data 2 work 53-3. In step 303, step 20 of the file editing mechanism 23 of the first computer 1 is executed.
Check data (C0) from the check data file 43 created / stored in Step 5 is checked data 1 work 43-5
Take it out. Next, in step 304, in step 30
Check data (C0) and (C1) extracted in 2 and 303
To match. When they match, it is determined that the master file restoration in the second computer 2 has been normally performed. If there is a mismatch as a result of the collation, it is determined that there is an abnormality in the restoration of the master file on the second computer 2. In this embodiment, the check data (C0 ') is transmitted / received between the first and second computers, but is not used. However, this data can be used for checking the communication path, checking the memory of the second computer, and the like. Since the present embodiment is configured as described above, only the data flow between computers is shown in FIG. This will be described below. While updating the hatched portion 83-1 of the x record 81 of the master file from a to b in the first computer 1 by the change instruction data 41 created in the first computer 1,
Check data (C0) 43 is created. The change instruction data 41 and the check data (C0) 43 are transmitted to the plurality of second computers 2 as change instruction information 84. The second computer 2 receives the change instruction information 84-1. The x record 91 of the master file of the second computer 2
Like the computer 1, the hatched portion 92-1 is updated from a to b based on the change instruction data 41-2, and the check data (C1) 53-1 is created with the same logic as that of the first computer 1. Check data (C0) 43-2 in the received change instruction information 84-1 and check data (C1) 5
3-1 and the master file 52 only when they match
To update. From this, it can be determined that the master file 52 restored in the second computer 2 is the same as that in the first computer 1. Also, the check data (C1) 53
-1 is transmitted as response data to the first computer 1.
Check data (C1) 53-received by the first computer 1
2 and the check data (C0) 43 created when the master file 42 is updated on the first computer 1, the first computer 1 checks the restoration status of the master file on the second computer 2 by checking the check data (C0) 43. Can be grasped. Here, when the hatched portion of the x record 91 is changed from a to b'in the master file update on the second computer 2 ',
Check data created from the updated x record 91
(C1 ′) 53-1 ′ is the check data (C0 ′) 43 in the change instruction information 84-1 received from the first computer 1.
If the value is different from -2, the second computer 2 '
Then, the master file 52 is not updated. further,
The check data (C1 ′) 53-1 ′ is stored in the first computer 1
Sent as a response to. When the check data (C1 ′) 53-2 ′ received by the first computer 1 and the check data (C0) 43 held by the first computer 1 are compared, they do not match, and the second computer 2 ′ uses the master file It is determined that the restoration of 52 is abnormal. This enables the first computer 1 to retransmit the master file change instruction data to the second computer 2 '. Conventionally, as shown in FIG. 13, when the master file 42 is changed in the first computer 1, the hatched portion 83-1 of the x record 81 is changed.
Is changed from a to b, the change instruction 41 is transmitted to the plurality of second computers 2, and the second computer 2 sends the master file 5
The hatched portion 92-1 of the x record 91 of 2 is changed from a to b. In the second computer 2 ′, the x record 91 of the master file 52 is stored in the same way as the second computer 2a.
Change from b'to b'and update the master file,
The computer 2'of No. 2 did not know that the change of the master file 52 was abnormal. Furthermore, in the first computer 1,
The second computer 2'could not know that there was an error in restoring the master file. For this reason, the second computer 2'may transmit information different from the master file of the first computer 1 to the plant control mechanism 35. Information transmission can be prevented. According to the present embodiment, the content inconsistency between the master of the important file and its copy, which is a problem of the autonomous distributed network communication, can be resolved, and as a result, it becomes possible to accurately control the plant and the like. It goes without saying that the present invention can be applied to networks other than the autonomous distributed network. Further, in the above embodiment, the change instruction is sent to the second computer, but the present invention is not limited to this, and the change information itself may be sent. For example, a first computer that creates a master file and at least one second computer that has a file having the same content as the master file to use the information of the master file, and the first computer In a communication system in which a second computer and a second computer are interconnected via a communication network, the first computer transmits the change information regarding the change of the master file to the second computer. The computer of (1) generates the first check data for checking whether the received change information has an error based on the change information, and the change information and the first check data. A first transmitting means for transmitting to the second computer via the communication network, the second computer receiving the change information and the first check data. Receiving means, second generating means for generating second check data for checking whether the received change information has an error, the first check data and the second check data. And a second transmitting means for transmitting the collation result to the first computer via the communication network when the result of the collation does not coincide. May be Further, in the above-mentioned embodiment, the check data is transmitted from the second computer to the first computer, but the present invention is not limited to this, and the second computer transfers the check data to the first computer. Only the result of comparing the check data may be sent. Further, in the above embodiment, the data is transmitted from the first computer to the second computer by the function code communication, but the present invention is not limited to this, and the first computer to the second computer is not limited to this. May be transmitted to the computer by a communication method that specifies the transmission destination.

[0007]

According to the present invention, a computer that manages a master file can know that the computer that uses the master file has an error in restoring the master file. Therefore, the master file of the computer that uses the master file and the master file of the computer that manages the master file can be matched. In this way, the content inconsistency between the master of the important file and its copy can be eliminated, and as a result, accurate control of the plant or the like can be performed.

[Brief description of drawings]

FIG. 1 is an overall block diagram of an embodiment of the present invention.

FIG. 2 is an allocation diagram of a work memory of a computer

FIG. 3 is a configuration diagram of a control mechanism.

FIG. 4 is a processing flow chart of a file change data generation mechanism of the first computer.

FIG. 5 is a processing flow chart of a file editing mechanism of the first computer.

FIG. 6 is a processing flow chart of a file restoration mechanism of the second computer.

FIG. 7 is a process flow diagram of a response data creation mechanism of the first computer.

FIG. 8 is a process flow diagram of a rationality check mechanism of the first computer.

FIG. 9 is a flowchart of a retransmission process of the rationality check mechanism of the first computer.

FIG. 10 is a data flow diagram in the first computer that creates, changes, and manages a master file.

FIG. 11 is a data flow diagram in the second computer that duplicates the master file from the first computer.

FIG. 12 is a simple operation explanatory view for explaining the operation of the present invention.

FIG. 13 is a simple operation explanatory diagram illustrating a conventional operation.

[Explanation of symbols]

 1 1st computer 2 2nd computer 10 Autonomous distributed network 41 Master file change instruction file of 1st computer 42 Master file of 1st computer 43 Check data file of 1st computer 52 Duplication of 2nd computer Master file 53 Check data file for the second computer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Kawaguchi 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Omika factory

Claims (8)

[Claims] 1. A first information processing device for creating a master file, and at least one second information processing device having a file having the same content as the master file for utilizing information of the master file. In the communication system in which the first information processing device and the second information processing device are interconnected via a communication network, the first information processing device is a change instruction for instructing a change of the master file. A first determining unit that receives information and determines the modification content of the master file, and the second information processing when transmitting modification instruction information that instructs modification of the file of the second information processing apparatus. The device
First generation means for generating, based on the change content, first check data for checking whether or not there is an error in the change content of the file obtained based on the received change instruction information; A first transmitting the instruction information and the first check data to the second information processing device via the communication network;
The second information processing device determines a change content of the file based on the received change instruction information and a receiving means for receiving the change instruction information and the first check data. Second determining means for generating, second generating means for generating second check data for checking whether or not there is an error in the changed content, based on the changed content, the first check data and the first check data The collation means for collating the check data of No. 2 and the information for confirming the collation result at least when the result of the collation does not coincide with each other, through the communication network.
And a second transmitting unit for transmitting the information to the information processing apparatus. 2. A first information processing device for creating a master file, and at least one second information processing device having a file having the same content as the master file for utilizing information of the master file. Then, in a communication system in which the first information processing device and the second information processing device are interconnected via a communication network, the first information processing device stores the file of the second information processing device. When the change information regarding the change is transmitted to the second information processing device, the second information processing device
The information processing apparatus generates first check data for checking whether the received change information has an error based on the change information, and the change information and the first check. A first transmitting unit that transmits data to the second information processing apparatus via the communication network, wherein the second information processing apparatus receives the change information and the first check data. Receiving means, second generating means for generating second check data for checking whether or not the received change information has an error, based on the change information, the first check data and the second check data. At least the collating means for collating the check data and the information for confirming the collation result, when the result of the collation does not coincide, is transmitted via the communication network.
And a second transmitting unit for transmitting the information to the information processing apparatus. 3. The communication system according to claim 1, wherein the first information processing apparatus also includes identification information for identifying the content of information to be transmitted when transmitting the information to the second information processing apparatus. Whether or not to receive the information output to the communication network by the identification information, the second information processing apparatus transmitting the information to the communication network without specifying the receiver. A communication system characterized by determining. 4. The communication system according to claim 1, 2 or 3, wherein the first information processing device is found to be inconsistent based on the information from the second information processing device that enables confirmation of the collation result. The communication system is characterized by retransmitting the information regarding the change of the master file to the second information processing device. 5. A first information processing device for creating a master file, and the first information processing device and the first information processing device are interconnected via a communication network, and are the same as the master file for utilizing information of the master file. In a communication method using at least one second information processing device having a file of contents, the first information processing device receives change instruction information for instructing a change of the master file, When the change information is decided and the change instruction information for instructing the change of the file of the second information processing apparatus is transmitted, the second information processing apparatus is
First check data for checking whether or not there is an error in the changed contents of the file obtained based on the received change instruction information is generated based on the changed contents, and the change instruction information and the first check data are generated. Check data is transmitted to the second information processing apparatus via the communication network, the second information processing apparatus receives the change instruction information and the first check data, and the received change instruction information Based on the change contents, the second check data for checking whether the change contents are incorrect is generated based on the change contents, and the first check data and the second check data are generated. The check data is collated, and at least when the result of the collation does not match, the information for confirming the collation result is sent to the first through the communication network.
And a communication method for transmitting the information to the information processing device. 6. A first information processing device that creates a master file, and the first information processing device and the first information processing device are interconnected via a communication network, and are the same as the master file for utilizing the information of the master file. In a communication method using at least one second information processing apparatus having a file of contents, the first information processing apparatus provides change information regarding a change of a file of the second information processing apparatus to the second information processing apparatus. When transmitting to the information processing device, the second
The information processing device of 1 generates the first check data for checking whether the received change information has an error based on the change information, and the change information and the first check data are generated in the communication network. Via the second information processing apparatus, the second information processing apparatus receives the change information and the first check data, and checks whether the received change information has an error. Second check data for generating the second check data based on the change information, the first check data and the second check data are collated, and at least when the collation results do not match, the collation result is confirmed. Information that can be transmitted to the first server via the communication network.
And a communication method for transmitting the information to the information processing device. 7. The communication method according to claim 5, wherein the first information processing device also includes identification information for identifying the content of information to be transmitted when transmitting the information to the second information processing device. Whether or not to receive the information output to the communication network by the identification information, the second information processing apparatus transmitting the information to the communication network without specifying the receiver. A communication method characterized by determining. 8. The communication method according to claim 5, 6 or 7, wherein the first information processing apparatus is found to be inconsistent based on the information from the second information processing apparatus that enables confirmation of the collation result. In the event of a failure, the communication method is characterized in that the information regarding the change of the master file is retransmitted to the second information processing device.